Magnesium castings grinding and polishing booth



E. F. FISHER Sept. 18, 1945.

MAGNESIUM CASTINGS GRINDING AND POLISHING BOOTHS Filed Nov. 24, 1941' INVENTOR. $7 @701,

Patented Sept. 18, 1945 MAGNESIUM CASTINGS GRINDING AND POLISHING BOOTH Ernest F. Fisher, Passaic, N. J., assignor to Whiting Corporation, Harvey, 11].,

Illinois a corporation of Application November 24, 1941, Serial No. 420,185

2 Claims.

My invention relates to improvements in mag.- nesium castings grinding and polishing booths which are used for polishing and grinding magnesium castings or for other hazardous dust creating operations.

My object is to provide a booth in which grinding and polishing operations may be performed without hazards due to explosion of dust.

Another object of my invention is to provide a booth of the class described that is simple in construction with simple non-mechanical means in the booth itself for producing a powerful air suction necessary to convey the dust from the grinding and polishing operations and to wet it for separation from the air stream so that the air can be released free from the dust and the dust reduced to a sludge.

These objects as well as other advantages inherent in the invention, will be apparent from a detailed description of the same in connection with the accompanying drawing in which;

Figure 1 is a vertical side sectional elevation taken on line l-l of Figure 2. Figure 2 is a partial front sectional elevation taken on line 2-2 of Figure 1 and Figure 3 is a half plan section taken on line 3-3 of Figure 1.

Referring to Figure 1 for the present, grille I forms a table or bench on which the grinding and polishing operations are performed. This grille forms the top of a series of rectangular hoppers 25 which transform at their lower ends to circular tubes 2, these tubes communicating with the air and water chamber 3. Hoppers 2a and tubes 2 form Venturi tubes. The air and water chamber 3 communicates with expansion chamber 4 through air passageway 5, the wall 4a of expansion chamber 4 forming the top of booth 6 and serving to guide and direct air downwardly onto the grilled table. The outlet of expansion chamber 4 is covered with spray eliminator plates 1 which prevent mist from passing out with the cleaned air.

Above the series of rectangular hoppers 2a and forming a part or slat of grille I is pipe manifold 8 with spray nozzles 9 each centered above a tube 2 and vaned cone Ill.

The operation of the grinding and polishing booth is as follows:

Castings on which grinding and polishing operations are to be performed are laid on grille I. Dust arising from these operations is pulled through the grille by air suction created by powerful water jets issuing from nozzles 9 and spraying into tubes 2 and impinging on vaned cones l 0.

This impinging action breaks up the water into a fine mist and intimately mixes the dust air and water. The water falls into chamber 3 from whence it is drained through drain outlet I to a sump or other means of disposal where the water is separated from the sludge and recirculated to nozzles 9 or otherwise disposed of. The cleaned air passes up through passageway 5 to expansion chamber 4 and thence through spray eliminator plates '1 to the outside.

The impingement vaned cones l0 are fully described in my Patent No, 2,032,404, issued March 3, 1936.

Having thus described my invention I claim as new and desire to secure by Letters Patent:

1. A grinding and polishing booth, comprising a grilled table for supporting an article being ground or polished, a Venturi-shaped dust collecting passage directly below said grilled table, the upper edges of the walls of said passage being connected with the outer edges of the grilled table, a sludge chamber below the exit end of the venturi, downwardly directed, suction creating nozzle means directly below said grilled table, for spraying liquid directly into the throat of the venturi, and projecting wetted dust, drawn through the grilled table by the suction, directly into said sludge chamber, and a laterally and upwardly extending passageway for carrying away air and spray deflected from the liquid surface in the sludge chamber.

2. A grinding and polishing booth, comprising a partially enclosed grilled table for supporting an article being ground or polished, said enclosure being formed in part by an inclined plate which slopes downwardly toward the far side of said grilled table, a Venturi shaped dust collecting passage directly below said grilled table, the upper edges of the walls of said passage being connected with the outer edges or the grilled table, a sludge chamber below the exit end of the venturi, downwardly directed, suction creating nozzle means directly below the grilled table, for spraying liquid directly into the throat of the Venturi, and projecting wetted dust, drawn through the grilled table by the suction, directly onto the liquid surface in the sludge chamber, and a laterally and upwardly extending passageway and expansion chamber, the expanding portion of which is defined by said inclined plate, for carrying away air, residual dust and spray deflected from the liquid surface in the sludge chamber.

' ERNEST F. FISHER. 

